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z in (-oo:+oo)
27 = z/0.3 // - z/0.3
27-(z/0.3) = 0
27-3.33333333*z = 0
27-3.33333333*z = 0 // - 27
-3.33333333*z = -27 // : -3.33333333
z = -27/(-3.33333333)
z = 8.10000001
z = 8.10000001
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